fix(server-core): Handle empty query in getSqlGenerator #3726

Job	Run time
latest-tag-sha	18s
Build native Linux 20 x86_64-unknown-linux-gnu Python fallback	2m 43s
build	7m 7s
tests (20.x, athena-export-bucket-s3)	19m 0s
tests (20.x, bigquery-export-bucket-gcs)	8m 2s
tests (20.x, clickhouse)	5m 48s
tests (20.x, clickhouse-export-bucket-s3)	6m 0s
tests (20.x, databricks-jdbc)	6m 13s
tests (20.x, databricks-jdbc-export-bucket-s3)	6m 48s
tests (20.x, databricks-jdbc-export-bucket-azure)	7m 12s
tests (20.x, mssql)	5m 39s
tests (20.x, mysql)	5m 33s
tests (20.x, postgres)	5m 9s
tests (20.x, redshift)	6m 32s
tests (20.x, redshift-export-bucket-s3)	6m 34s
tests (20.x, snowflake)	5m 43s
tests (20.x, snowflake-export-bucket-s3)	5m 54s
tests (20.x, snowflake-export-bucket-azure)	5m 36s
tests (20.x, snowflake-export-bucket-azure-via-storage-integration)	5m 43s
tests (20.x, snowflake-export-bucket-gcs)	5m 42s
	2h 7m 16s

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